In IEEE 802.11 wireless LANs, channel quality, network load, as well as the protocol itself are time-varying, limiting the goodput performance improvement in wireless LANs. Therefore, it becomes critical to dynamically adjust parameters of MAC and PHY layers according to variations of channel quality. In this paper, we propose variable frame size and variable data rate schemes for goodput enhan...

The explosive growth of the Internet is expected to produce a tremendous increase in the demand for wireless multimedia services. First and second generation wireless networks have proven capable of providing voice and low-rate data services; however, their current air interfaces are inadequate for satisfying the higher data rates that have been specified by the ITU for IMT-2000. In order to sa...

Optical LANs versus copper LANs — CIOs and IT professionals are finding solutions to the many network challenges created by the emergence of big data, big data analytics, the virtual desktop, hosted/managed services, software-defined networks, cloud-based computing, wireless (3G/4G, DAS, Wi-Fi, BYOD) communications, the Internet of Things and smart-building technologies. Yet oddly enough, many ...

Enterprise networks are facing disruptive change caused by the use of Internet versus enterprise based applications, increasing video content, integration of voice services onto the LAN, and the transition from wired to wireless LANs. This paper explores this opportunity to adopt Passive Optical LANs (POLs), based on Gigabit Passive Optical Network technology (GPON), rather than continuing with...

The IEEE network technology is the emerging standard for wireless LANs and mobile networking The fundamental access mechanism in the IEEE MAC protocol is the Distributed Coordination Function In this paper we present an analytical method of estimating the saturation throughput of wireless LAN in the assumption of ideal channel conditions The proposed method generalizes the existing LAN models a...

IEEE 802.11 PCF mode is defined to support timebounded applications in wireless LANs. The poll scheduling plays an important role in PCF mode operation. It differs from the packet scheduling of routers in that incomplete queueing information in each pollable station is known to the scheduler. This paper proposes an adaptive polling algorithm to improve the wireless medium utilization. In our sc...